EP2743209B1 - Water treatment vessel intended for being buried, including an outer wall having projecting elements - Google Patents

Water treatment vessel intended for being buried, including an outer wall having projecting elements Download PDF

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Publication number
EP2743209B1
EP2743209B1 EP13197050.1A EP13197050A EP2743209B1 EP 2743209 B1 EP2743209 B1 EP 2743209B1 EP 13197050 A EP13197050 A EP 13197050A EP 2743209 B1 EP2743209 B1 EP 2743209B1
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EP
European Patent Office
Prior art keywords
tank
projecting elements
tank according
water
wall
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EP13197050.1A
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German (de)
French (fr)
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EP2743209A1 (en
Inventor
Jean-Pierre Guyader
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Innoclair SAS
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Innoclair SAS
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
    • E03B3/02—Methods or installations for obtaining or collecting drinking water or tap water from rain-water
    • E03B3/03—Special vessels for collecting or storing rain-water for use in the household, e.g. water-butts
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F11/00—Cesspools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/76—Large containers for use underground
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/108—Rainwater harvesting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/208—Off-grid powered water treatment

Definitions

  • the field of the invention relates to the design and manufacture of wastewater treatment equipment. More specifically, the invention relates to an individual treatment plant, of the type incorporating a ventilation tank and a clarification tank, the latter using a siphoid wall.
  • NCA non-collective sanitation
  • a micro-wastewater treatment plant can be defined as a solution for the treatment of domestic wastewater, operating on a reduced scale according to the same principle as an urban wastewater treatment plant, by the implementation of a process known as activated sludge "or" fixed culture ".
  • the "activated sludge” treatment process consists in using the microorganisms or bacteria present in the water to be treated in order to degrade the organic matter present in the said waters, without resorting to the addition of chemicals. .
  • Such a treatment makes it possible to reject the treated water directly in the natural environment or, alternatively, to use it in infiltration.
  • the "activated sludge" treatment implies a regular supply of organic matter to allow the bacteria to develop and thus to treat the water. Also, a prolonged absence of water flow in the micro-station will imply the need for reactivation of the bacteria.
  • the invention relates in particular to the stations operating a treatment called "activated sludge, and can be applied to any type of treatment, including" fixed cultures ".
  • the invention can also be applied to tanks constituting simple water tanks, all-water pits or buried gas tanks.
  • the micro-stations are tanks constituting reservoirs of water containing a set of mechanisms (air compressor, pump, electrical panel ...) and usually intended to be buried.
  • these tanks are under the pressure of the soil which is exerted on the walls of the tank and which creates a risk of lateral and / or vertical crushing of the tank.
  • the principle of Archimedes is verified when water is present in the soil in which the micro-station is buried, which can lead to lifting the tank under the pressure of water to the point of requiring intervention civil engineering.
  • micro-activated sludge purification stations give overall satisfaction according to the current purification criteria.
  • siphoid partitions are used to delimit a siphoid zone of water to be evacuated (thus treated), at the base of which is formed a passage of reduced dimensions in which flows a water slightly loaded with suspended matter.
  • the invention particularly aims to overcome the disadvantages of the prior art.
  • the invention aims to provide a tank that is simpler and faster to install than the treatment tanks and / or water storage of the prior art.
  • the invention aims to significantly limit the civil engineering operations related to the installation of the micro-wastewater treatment plant in the soil.
  • Another object of the invention is to provide such a tank intended to constitute a micro-station for the purification of domestic wastewater by activated sludge, which produces a treated water of satisfactory quality in all or almost all circumstances.
  • a treatment and / or storage tank for water intended to be buried comprising an outer wall delimiting an enclosure of treatment, especially that of a micro-treatment plant, the outer wall having projecting elements each having a substantially flat bearing surface against which a backfill material is likely to exert a force directed towards the bottom of the tank, characterized in that the projecting elements have a triangular section.
  • the simple act of backfilling around the water treatment tank placed in an excavation ensures the maintenance of the tank at the bottom of the excavation.
  • gravel and sand usually used for backfilling, for their fluidity
  • the installation operation of the tank is greatly facilitated and shortened, in that it is no longer necessary to make a concrete slab and / or decompression well.
  • the projecting elements also provide a reinforcement function of the tank.
  • the bearing surface overhangs a lower surface, the inclination of the bearing surface with respect to a horizontal line being ⁇ 3 and the inclination of the lower surface with respect to a horizontal line being ⁇ 4, with ⁇ 3 ⁇ 4.
  • the projecting elements form at least one peripheral belt, and advantageously at least two peripheral belts joined vertically (without space between them).
  • the projecting elements form three peripheral belts one above the other.
  • the projecting elements also appear inside the tank.
  • the water treatment tank according to the invention includes at least two enclosures of an individual purification station, one of aeration and the other of clarification, the water to be purified.
  • the clarification chamber passing from one to the other, the clarification chamber being connected to an outlet duct by a siphoid zone delimited by a siphoid partition, a filter material is disposed in the siphoid zone so that the water passes through the material filter, the latter being intended to fix the suspended matter in the water.
  • the individual treatment plants according to the invention eliminate, or at least limit, the risk of starting sludge, by the presence of the filter material.
  • the disposal of the filter material in the siphoid zone is particularly effective insofar as the waters present in the siphoid zone are the least loaded suspended matter.
  • the action of the filter material is therefore largely sufficient compared to the amount of suspended solids present in the siphoid zone. It also results that the filter material clogs less rapidly being present in this area and, therefore, it is necessary to replace it with a relatively low frequency.
  • the invention applies to any type of water treatment tank and is therefore not limited to its application in activated sludge treatment.
  • the invention also applies to simple storage of water, the tank constituting for example a reserve of rainwater, or a pit all water buried, or a gas tank buried.
  • the filter material is disposed in the upper part of the siphoid zone.
  • the siphoid wall is preferably arranged facing one of the side walls.
  • the siphoid wall extends from its lower end in the vicinity of said side wall and deviates from it upward to define a storage space of said filter material.
  • the filter material is present in a tray removably disposed in a storage space extending between the side wall and the siphoid wall.
  • the filter material is thus easily accessible, and can be easily and quickly replaced when needed.
  • the tray containing the filter element has a shape adapted to the shape of the projecting elements.
  • a tank 1 for treatment and / or storage of water according to the invention has an external wall has projecting elements 4.
  • Each of these projecting elements has a bearing surface 40, essentially flat, against which a backfill material is capable of exerting a force directed towards the bottom 115 of the tank and thus towards the bottom of the excavation in which is installed the tank.
  • the projecting elements 4 form at least one belt around the tank, and preferably three (or more) belts distributed over the height of the tank as illustrated by the figure 1 .
  • the projecting elements 4 have a triangular section, including a bearing surface 40 overlying a lower surface 41.
  • the bearing surface 40 of the projecting elements may be horizontal or slightly inclined downwards.
  • inclinations of the bearing surfaces 40 and 41 are provided so that ⁇ 3 ⁇ 4.
  • the outer ends of the projecting elements are arranged one above the other so as to fit in the same vertical plane.
  • the tank has a different external shape, for example cylindrical, pyramidal ...
  • angle values indicated above are optimized to promote the filling of the space between the outer wall of the tank and the walls of the excavation by the backfill material.
  • the inclinations of the bearing surfaces of the projecting elements facilitate in some ways the flow of the filler material, in particular between two projecting elements, that is to say in the cavity they delimit.
  • a tank is provided to receive an electrical panel intended to supply a compressor (not shown) from which extends an air duct opening into the ventilation enclosure 10.
  • the compressor of the ventilation chamber is programmed to perform successive cycles of aeration of the water present in the ventilation enclosure. It is recalled that the purpose of the aeration chamber is to carry out successive aerobic and anoxic phases, with a view to causing digestion of the organic matter present in the water to be treated.
  • a duct 100 opens into the ventilation enclosure, the water to be treated arriving in the station via this duct 100.
  • the ventilation chamber is separated from the settling chamber / clarification by a partition wall 12 in which is formed an orifice 120 communicating with a pipe 111, extending towards the bottom of the clarification chamber.
  • An outlet duct 110 extends from the settling / clarification chamber, to allow the outlet of the treated water.
  • This duct 110 is provided in the upper part of the settling chamber / clarification. Therefore, it is necessary that the water level increases sufficiently in the settling chamber / clarification, to reach the level of the outlet duct.
  • the heaviest suspended solids decant during the non-operating phase of the pump 112, while only the finest and lighter suspended solids may possibly rise with the water level.
  • a siphoid zone 20 constitutes a compulsory passage of water circulation in the station, connecting the internal volume of the clarification chamber to the outlet conduit.
  • This siphoid zone in which the waters are weakly charged with suspended matter, is delimited by a siphoid partition described in more detail later.
  • a filter material 3 is disposed in the siphoid zone 20 delimited by the siphoid partition 2, this filtering material extending in such a way that the water necessarily passes through the filtering material, the latter being intended to fix suspended matter. in the waters.
  • the filter material is constituted by pozzolana (or volcanic rock).
  • the siphoid wall 2 is arranged to face one of the side walls 114.
  • the siphoid wall extends from its lower end 21 in the vicinity of one of the side walls 114 and goes up towards the upper part of the settling / clarification chamber, this deviating from the corresponding side wall 114, until delimiting a storage space 22 of the filtering material 3.
  • the siphoid partition 2 extends to form a box 23 provided with a bottom, inside which opens the outlet duct. This portion of quasi-cubic shape is therefore the sampling area.
  • the storage space therefore extends between the siphoid wall, above the inclined part thereof, and the side wall, at the level where the highest projecting element of the tank forms, at the inside the tank, a concavity.
  • the filter material 3 is present in a tray 30 removably disposed in the storage space.
  • the angle ⁇ 2 ( figure 4 ) between the upper surface 40 and the lower surface 41 of the projecting elements, inside the tank, is equal to the angle ⁇ 1, outer side, or about 90 °.
  • the partition wall 12 has side edges 121 of complementary shape of the projecting elements.
  • the tray containing the filter element also has a shape adapted to the shape of the projecting elements.
  • this filtering tank and this sampling chamber are set up in the factory, and come to rest vertically against the inclined part of the siphoid wall on the one hand and against the lower surface of an element on the other hand projecting.

Description

Le domaine de l'invention concerne la conception et la fabrication des équipements de traitement des eaux usées. Plus précisément, l'invention concerne une station d'épuration individuelle, du type intégrant un bassin d'aération et un bassin de clarification, ce dernier mettant en oeuvre une cloison siphoïde.The field of the invention relates to the design and manufacture of wastewater treatment equipment. More specifically, the invention relates to an individual treatment plant, of the type incorporating a ventilation tank and a clarification tank, the latter using a siphoid wall.

Dans le cadre de l'assainissement non collectif, on distingue les habitations reliées au réseau de collecte de leur commune et celles qui ne le sont pas. Jusqu'à récemment, les habitations non reliées au réseau de collecte étaient équipées généralement, voire dans le meilleur des cas, d'une fosse septique pour le traitement des eaux usées domestiques (hors eaux pluviales) associée à un bac à sable filtrant.In the context of non-collective sanitation, we distinguish houses connected to the collection network of their municipality and those that are not. Until recently, homes not connected to the collection network were equipped generally, or even at best, with a septic tank for the treatment of domestic wastewater (excluding rainwater) associated with a filter sandbox.

L'évolution des normes et réglementations impose désormais aux habitations non reliées au réseau de collecte de leur commune de disposer d'un système d'assainissement individuel, visant à renvoyer au milieu naturel les eaux traitées d'une qualité satisfaisante prédéterminée.The evolution of standards and regulations now requires homes not connected to the collection network of their municipality to have an individual sanitation system, aimed at returning to the natural environment treated water of a predetermined satisfactory quality.

Les textes actuellement en vigueur définissent l'assainissement individuel, autrement désigné par assainissement non collectif (ANC) comme correspondant à « tout système d'assainissement effectuant la collecte, le prétraitement, l'épuration, l'infiltration ou le rejet des eaux usées domestiques des immeubles non raccordés au réseau public d'assainissement ».The texts currently in force define individual sanitation, otherwise referred to as non-collective sanitation (NCA) as "any sanitation system that collects, pre-processes, purifies, infiltrates or discharges domestic wastewater. buildings not connected to the public sewerage network ".

Dans ce contexte, une solution pour les particuliers non reliés au réseau de collecte de leur commune consiste à recourir à l'installation d'une micro-station d'épuration.In this context, a solution for individuals not connected to the collection network of their community is to resort to the installation of a micro-wastewater treatment plant.

Une micro-station d'épuration peut se définir comme une solution de traitement des eaux usées domestiques, fonctionnant à échelle réduite selon le même principe qu'une station d'épuration urbaine, ceci par la mise en oeuvre d'un procédé dit « à boue activée » ou « à culture fixée ».A micro-wastewater treatment plant can be defined as a solution for the treatment of domestic wastewater, operating on a reduced scale according to the same principle as an urban wastewater treatment plant, by the implementation of a process known as activated sludge "or" fixed culture ".

Le procédé de traitement « à boue activée » consiste à mettre à contribution les micro-organismes ou les bactéries présents dans les eaux à traiter en vue de dégrader les matières organiques présentes dans les dites eaux, ceci sans recourir à l'adjonction de produits chimiques.The "activated sludge" treatment process consists in using the microorganisms or bacteria present in the water to be treated in order to degrade the organic matter present in the said waters, without resorting to the addition of chemicals. .

Un tel traitement permet de rejeter les eaux traitées directement dans le milieu naturel ou, alternativement, de les utiliser en infiltration.Such a treatment makes it possible to reject the treated water directly in the natural environment or, alternatively, to use it in infiltration.

On distingue, parmi les effluents rejetés par une habitation, deux catégories, à savoir :

  • les « eaux grises », correspondant aux eaux provenant des lavabos, lave-linges, douche, etc ;
  • les « eaux-vannes », correspondant aux eaux rejetées par les toilettes.
Among the effluents released by a dwelling, two categories are distinguished, namely:
  • "gray water", corresponding to water from sinks, washing machines, showers, etc .;
  • the "water-valves", corresponding to the waters rejected by the toilets.

L'ensemble de ces effluents contient :

  • des matières organiques ;
  • des matières azotées et phosphorées ;
  • des micro-organismes pathogènes ;
  • des matières en suspension pouvant provoquer des maladies, de la pollution organique et de l'eutrophisation.
All of these effluents contain:
  • organic materials;
  • nitrogen and phosphorus materials;
  • pathogenic microorganisms;
  • suspended solids that can cause disease, organic pollution and eutrophication.

Classiquement, les micro-stations d'épuration sont conçues pour réaliser les phases de traitement suivantes :

  • la décantation, visant à retenir au fond de la cuve les matières les plus lourdes et à faire remonter en surface les plus légères ;
  • l'aération, selon laquelle les « boues » en suspension subissent un traitement d'épuration, ceci en créant de manière séquentielle des périodes aérobies et des périodes d'anoxie, ce qui va permettre d'engendrer un phénomène de digestion des matières organiques, ainsi qu'une réduction des nitrates et des nitrites ;
  • la clarification (éventuellement précédée d'une pré-clarification), visant à séparer les boues légères persistantes de l'eau épurée : dans cette phase, les boues restantes sont renvoyées dans le bassin de décantation ou dans le bassin de réaction, tandis que l'eau épurée est extraite de la micro-station pour être en général dispersée dans le sol, ou rejetée au fossé.
Conventionally, the micro-wastewater treatment plants are designed to carry out the following treatment phases:
  • the decantation, aiming to retain the heaviest materials at the bottom of the tank and to bring the lighter ones to the surface;
  • the aeration, according to which the "sludge" in suspension undergo a treatment of purification, this by creating sequentially aerobic periods and periods of anoxia, which will allow to generate a phenomenon of digestion of organic matter, as well as a reduction of nitrates and nitrites;
  • clarification (possibly preceded by a pre-clarification), aiming at separating the persistent light sludge from the purified water: in this phase, the remaining sludge is returned to the settling basin or the reaction pond, while the purified water is extracted from the micro-station to be generally dispersed in the soil, or discharged to the ditch.

Les avantages des micro-stations sont notamment les suivants :

  • elles mettent en oeuvre des procédés de traitement écologique et n'utilisent aucun produit chimique pour traiter les eaux usées ;
  • la surface au sol de la micro-station est notablement limitée et ne nécessite pas d'épandage sous-terrain, ce qui permet de les installer même dans des petits terrains, éventuellement avec un dénivelé ;
  • elle ne dégage pas d'odeurs.
The advantages of micro-stations include:
  • they use environmentally friendly treatment processes and do not use chemicals to treat wastewater;
  • the ground surface of the micro-station is notably limited and does not require underground spreading, which makes it possible to install them even in small areas, possibly with a difference in level;
  • it does not give off odors.

En revanche, le traitement « à boue activée » implique un apport régulier de matières organiques pour permettre aux bactéries de se développer et donc de traiter les eaux. Aussi, une absence prolongée d'écoulement d'eau dans la micro-station impliquera la nécessité de réactivation des bactéries.On the other hand, the "activated sludge" treatment implies a regular supply of organic matter to allow the bacteria to develop and thus to treat the water. Also, a prolonged absence of water flow in the micro-station will imply the need for reactivation of the bacteria.

Selon l'art antérieur, on distingue deux types de micro-station d'épuration :

  • les stations opérant une épuration par boue activée, telle que décrite précédemment ;
  • les stations à culture fixée dans lesquelles les micro-organismes chargés du traitement se fixent sur un support en fond de cuve.
According to the prior art, there are two types of micro-purification station:
  • stations operating an activated sludge treatment, as previously described;
  • the fixed culture stations in which the microorganisms in charge of the treatment are fixed on a support at the bottom of the tank.

L'invention concerne notamment les stations opérant un traitement dit « à boue activée, et peut s'appliquer à tout type de traitement, notamment par « cultures fixées ». L'invention peut s'appliquer en outre aux cuves constituant de simples réservoirs d'eau, des fosses toutes eaux ou des citernes à gaz enterrées.The invention relates in particular to the stations operating a treatment called "activated sludge, and can be applied to any type of treatment, including" fixed cultures ". The invention can also be applied to tanks constituting simple water tanks, all-water pits or buried gas tanks.

Schématiquement, les micro-stations sont des cuves constituant des réservoirs d'eau contenant un ensemble de mécanismes (compresseur d'air, pompe, tableau électrique...) et généralement destinés à être enterrés.Schematically, the micro-stations are tanks constituting reservoirs of water containing a set of mechanisms (air compressor, pump, electrical panel ...) and usually intended to be buried.

Une fois enterrés, ces cuves subissent la pression du sol qui s'exerce sur les parois du réservoir et qui engendre un risque d'écrasement latéral et/ou vertical de la cuve. De plus, le principe d'Archimède se vérifie quand de l'eau est présente dans le sol dans lequel la micro-station est enterrée, ce qui peut conduire à soulever la cuve sous la pression de l'eau au point de nécessiter une intervention de génie civil.Once buried, these tanks are under the pressure of the soil which is exerted on the walls of the tank and which creates a risk of lateral and / or vertical crushing of the tank. In addition, the principle of Archimedes is verified when water is present in the soil in which the micro-station is buried, which can lead to lifting the tank under the pressure of water to the point of requiring intervention civil engineering.

En effet, pour limiter ce risque, les entreprises de génie civil utilisent classiquement du béton en tant que dalle de lestage basse ou haute, ainsi que des sangles d'arrimage qui accrochent la cuve au béton. En outre, un puits de décompression peut être réalisé pour dégager la pression de l'eau vers la surface. Parallèlement, les fabricants de cuves utilisent des renforts latéraux, horizontaux ou verticaux, pour permettre à la cuve de la micro-station de résister à la pression.In fact, to limit this risk, civil engineering firms typically use concrete as a low or high ballast slab, as well as tie-down straps that hook the tank to the concrete. In addition, a decompression well may be provided to release the pressure of the water to the surface. At the same time, tank manufacturers use lateral reinforcements, horizontal or vertical, to allow the tank of the micro-station to withstand the pressure.

On comprend que l'installation d'une micro-station d'épuration nécessite donc une attention particulière en termes de génie civil afin de pallier tout risque de remontée de la cuve sous l'effet de la pression de l'eau présente dans le sol.It is understood that the installation of a micro-treatment plant therefore requires special attention in terms of civil engineering to mitigate any risk of rise of the tank under the effect of the pressure of water in the soil .

En tout état de cause, ces opérations sont relativement longues, fastidieuses et couteuses à réaliser.In any case, these operations are relatively long, tedious and expensive to perform.

Il est connu du document US5806702 un réservoir d'eaux usées dont la paroi externe présente des éléments en saillie. Le document WO02066753 présente un conduit formant trou d'homme, présentant également une paroi externe avec des éléments en saillie.It is known from the document US5806702 a wastewater tank whose outer wall has projecting elements. The document WO02066753 has a manway conduit, also having an outer wall with projecting elements.

Par ailleurs, les micro-stations d'épuration par boue activée donnent globalement satisfaction selon les critères d'épuration actuels.In addition, micro-activated sludge purification stations give overall satisfaction according to the current purification criteria.

Toutefois, on peut déplorer dans certains cas que l'eau sortant d'une micro-station d'épuration soit insuffisamment traitée, voire que la station fasse l'objet d'un départ de boue qui peut être dû à une absence prolongée, comme mentionné précédemment, ou à un rejet d'un produit d'entretien ménager qui neutralise les bactéries, ou encore à une coupure d'électricité au cours de laquelle le compresseur servant au cycle d'aération ne fonctionne plus.However, it can be deplored in some cases that the water leaving a micro-treatment plant is insufficiently treated, or that the station is subject to a sludge that may be due to a prolonged absence, such as previously mentioned, or a rejection of a product cleaning that neutralizes bacteria, or a power cut during which the compressor used for the aeration cycle no longer works.

Il existe donc un besoin d'optimisation du fonctionnement des micro-stations d'épuration.There is therefore a need to optimize the operation of the micro-purification stations.

Dans le contexte des stations d'épuration collectives, c'est-à-dire de grandes dimensions, les cloisons siphoïdes sont utilisées pour délimiter une zone siphoïde d'eau à évacuer (donc traitée), à la base de laquelle est formé un passage de dimensions réduites dans lequel s'écoule une eau faiblement chargée en matières en suspension.In the context of collective sewage treatment plants, ie large ones, siphoid partitions are used to delimit a siphoid zone of water to be evacuated (thus treated), at the base of which is formed a passage of reduced dimensions in which flows a water slightly loaded with suspended matter.

Ce principe est actuellement très peu utilisé dans les micro-stations d'épuration, et ne permet pas en tout état de cause de supprimer les phénomènes de départ de boue.This principle is currently very little used in the micro-purification stations, and does not in any case to suppress the phenomena of mud flow.

L'invention a notamment pour objectif de pallier les inconvénients de l'art antérieur.The invention particularly aims to overcome the disadvantages of the prior art.

Plus précisément, l'invention a pour objectif de proposer une cuve qui soit plus simple et plus rapide à installer que les cuves de traitement et/ou de stockage d'eaux de l'art antérieur.More specifically, the invention aims to provide a tank that is simpler and faster to install than the treatment tanks and / or water storage of the prior art.

En ce sens, l'invention a pour objectif de limiter notablement les opérations de génie civil liées à l'installation de la micro-station d'épuration dans le sol.In this sense, the invention aims to significantly limit the civil engineering operations related to the installation of the micro-wastewater treatment plant in the soil.

L'invention a également pour objectif de fournir une telle cuve destinée à constituer une micro-station d'épuration d'eaux usées domestiques, par boue activée, qui produise une eau traitée d'une qualité satisfaisante en toutes circonstances ou quasiment.Another object of the invention is to provide such a tank intended to constitute a micro-station for the purification of domestic wastewater by activated sludge, which produces a treated water of satisfactory quality in all or almost all circumstances.

Ces objectifs, ainsi que d'autres qui apparaîtront par la suite, sont atteints grâce à l'invention qui a pour objet une cuve de traitement et/ou de stockage d'eaux destinée à être enterrée, comprenant une paroi externe délimitant une enceinte de traitement, notamment celle d'une micro-station d'épuration,, la paroi externe présentant des éléments en saillie présentant chacun une surface d'appui essentiellement plane contre laquelle un matériau de remblaiement est susceptible d'exercer une force dirigée vers le fond de la cuve, caractérisée en ce que les éléments en saillie présentent une section de forme triangulaire.These objectives, as well as others which will appear later, are achieved by virtue of the invention, which relates to a treatment and / or storage tank for water intended to be buried, comprising an outer wall delimiting an enclosure of treatment, especially that of a micro-treatment plant, the outer wall having projecting elements each having a substantially flat bearing surface against which a backfill material is likely to exert a force directed towards the bottom of the tank, characterized in that the projecting elements have a triangular section.

Ainsi, grâce à l'invention, le simple fait de remblayer autour de la cuve de traitement d'eaux placée dans une excavation assure le maintien de la cuve au fond de l'excavation. En effet, les graviers et les sables (généralement utilisés pour remblayer, pour leur fluidité) vont épouser les contours de la forme extérieure de la cuve, exerçant ainsi une poussée vers le bas sur les éléments en saillie.Thus, thanks to the invention, the simple act of backfilling around the water treatment tank placed in an excavation ensures the maintenance of the tank at the bottom of the excavation. Indeed, gravel and sand (usually used for backfilling, for their fluidity) will marry the contours of the outer shape of the tank, thus exerting a push down on the projecting elements.

L'opération d'installation de la cuve est donc grandement facilitée et raccourcie, dans la mesure où il n'est plus nécessaire de faire une dalle de béton et/ou de puits de décompression.The installation operation of the tank is greatly facilitated and shortened, in that it is no longer necessary to make a concrete slab and / or decompression well.

En outre, comme cela va apparaître plus clairement par la suite, les éléments en saillie assurent également une fonction de renfort de la cuve.In addition, as it will appear more clearly later, the projecting elements also provide a reinforcement function of the tank.

Selon une solution préférée, pour chaque élément en saillie, la surface d'appui surplombe une surface inférieure, l'inclinaison de la surface d'appui par rapport à une ligne horizontale étant de α3 et l'inclinaison de la surface inférieure par rapport à une ligne horizontale étant de α4, avec α3 < α4.According to a preferred solution, for each projecting element, the bearing surface overhangs a lower surface, the inclination of the bearing surface with respect to a horizontal line being α3 and the inclination of the lower surface with respect to a horizontal line being α4, with α3 <α4.

On obtient de cette façon un bon compromis entre l'inclinaison de la surface d'appui, pour que la force du matériau de remblaiement sur celle-ci s'exerce essentiellement vers le fond de la cuve, et l'inclinaison de la surface inférieure qui contribue au bon écoulement du matériau de remblaiement entre la cuve et l'excavation.In this way, a good compromise is achieved between the inclination of the bearing surface, so that the force of the backfill material on the latter is exerted essentially towards the bottom of the tank, and the inclination of the lower surface which contributes to the good flow of the backfill material between the tank and the excavation.

Selon une solution avantageuse, les éléments en saillie forment au moins une ceinture périphérique, et avantageusement au moins deux ceintures périphériques jointives verticalement (sans espace entre elles).According to an advantageous solution, the projecting elements form at least one peripheral belt, and advantageously at least two peripheral belts joined vertically (without space between them).

Préférentiellement, les éléments en saillie forment trois ceintures périphériques les unes au-dessus des autres.Preferably, the projecting elements form three peripheral belts one above the other.

Une telle disposition en ceintures contribue à :

  • augmenter la surface d'appui pour les remblais ;
  • contribuer au renfort tant vertical qu'horizontal de la cuve.
Such an arrangement in belts contributes to:
  • increase the support surface for embankments;
  • contribute to the vertical and horizontal reinforcement of the tank.

Selon un mode de réalisation particulier, les éléments en saillie apparaissent également à l'intérieur de la cuve.According to a particular embodiment, the projecting elements also appear inside the tank.

Selon une autre caractéristique avantageuse, dans laquelle la cuve de traitement d'eaux selon l'invention inclut au moins deux enceintes d'une station d'épuration individuelle, l'une d'aération et l'autre de clarification, les eaux à épurer passant de l'une dans l'autre, l'enceinte de clarification étant reliée à un conduit de sortie par une zone siphoïde délimitée par une cloison siphoïde, un matériau filtrant est disposé dans la zone siphoïde de telle sorte les eaux passent par le matériau filtrant, celui-ci étant destiné à fixer les matières en suspension dans les eaux.According to another advantageous characteristic, in which the water treatment tank according to the invention includes at least two enclosures of an individual purification station, one of aeration and the other of clarification, the water to be purified. passing from one to the other, the clarification chamber being connected to an outlet duct by a siphoid zone delimited by a siphoid partition, a filter material is disposed in the siphoid zone so that the water passes through the material filter, the latter being intended to fix the suspended matter in the water.

De cette façon, on obtient une cuve de traitement constituant une station d'épuration individuelle produisant une eau traitée de meilleure qualité qu'avec les stations d'épuration individuelles de l'art antérieur, ceci en toutes circonstances.In this way, a treatment tank is obtained constituting an individual treatment plant producing a treated water of better quality than with the individual purification plants of the prior art, this in all circumstances.

En effet, les actions combinées de l'aération/clarification d'une part et, d'autre part, du matériau filtrant, conduit à un traitement optimal des eaux usées domestiques.Indeed, the combined actions of aeration / clarification on the one hand, and the filter material, on the other hand, leads to an optimal treatment of domestic wastewater.

En outre, les stations d'épuration individuelles selon l'invention suppriment, ou à tout le moins limitent, les risques de départ de boue, de par la présence du matériau filtrant.In addition, the individual treatment plants according to the invention eliminate, or at least limit, the risk of starting sludge, by the presence of the filter material.

On note de plus que la disposition du matériau filtrant dans la zone siphoïde s'avère particulièrement efficace dans la mesure où les eaux présentes dans la zone siphoïde sont les moins chargées en matières en suspension. L'action du matériau filtrant est donc largement suffisante par rapport à la quantité de matières en suspension présentes dans la zone siphoïde. Il en résulte par ailleurs que le matériau filtrant s'encrasse moins rapidement en étant présent dans cette zone et, par conséquent, il n'est nécessaire de procéder à son remplacement qu'avec une fréquence relativement faible.It is further noted that the disposal of the filter material in the siphoid zone is particularly effective insofar as the waters present in the siphoid zone are the least loaded suspended matter. The action of the filter material is therefore largely sufficient compared to the amount of suspended solids present in the siphoid zone. It also results that the filter material clogs less rapidly being present in this area and, therefore, it is necessary to replace it with a relatively low frequency.

On note toutefois que l'invention s'applique à tout type de cuve de traitement d'eau et ne se limite donc pas à son application dans un traitement par boue activée. L'invention s'applique en outre au simple stockage d'eaux, la cuve constituant par exemple une réserve d'eaux de pluie, ou une fosse toutes eaux enterrée, ou encore une citerne à gaz enterrée.However, it is noted that the invention applies to any type of water treatment tank and is therefore not limited to its application in activated sludge treatment. The invention also applies to simple storage of water, the tank constituting for example a reserve of rainwater, or a pit all water buried, or a gas tank buried.

Préférentiellement, le matériau filtrant est disposé en partie supérieure de la zone siphoïde.Preferably, the filter material is disposed in the upper part of the siphoid zone.

Cette caractéristique contribue à améliorer les effets énoncés ci-avant, dans la mesure où plus le matériau filtrant est placé haut dans la station, moins il y a possiblement de matières en suspensions dans les eaux au niveau où il est placé.This feature helps to improve the effects stated above, since the higher the filter material is placed in the station, the less likely there is suspended matter in the water at the level where it is placed.

Selon une caractéristique avantageuse d'une station d'épuration individuelle mettant en oeuvre une cuve de traitement d'eau selon l'invention, dans laquelle l'enceinte de clarification est délimitée par une paroi de séparation commune avec l'enceinte d'aération et par une paroi de sortie reliées par deux parois latérales, la cloison siphoïde est préférentiellement disposée face à l'une des parois latérales.According to an advantageous characteristic of an individual purification station using a water treatment tank according to the invention, in which the clarification chamber is delimited by a dividing wall shared with the ventilation chamber and by an outlet wall connected by two side walls, the siphoid wall is preferably arranged facing one of the side walls.

Dans ce cas, la cloison siphoïde s'étend à partir de son extrémité inférieure au voisinage de ladite paroi latérale et s'écarte de celle-ci en remontant jusqu'à délimiter un espace de stockage dudit matériau filtrant.In this case, the siphoid wall extends from its lower end in the vicinity of said side wall and deviates from it upward to define a storage space of said filter material.

Avantageusement, le matériau filtrant est présent dans un bac disposé de façon amovible dans un espace de stockage s'étendant entre la paroi latérale et la cloison siphoïde.Advantageously, the filter material is present in a tray removably disposed in a storage space extending between the side wall and the siphoid wall.

Le matériau filtrant est ainsi aisément accessible, et peut être facilement et rapidement remplacé en cas de besoin.The filter material is thus easily accessible, and can be easily and quickly replaced when needed.

Préférentiellement, le bac contenant l'élément filtrant présente une forme adaptée à la forme des éléments en saillie.Preferably, the tray containing the filter element has a shape adapted to the shape of the projecting elements.

D'autres caractéristiques et avantages de l'invention apparaitront plus clairement à la lecture de la description suivante d'un mode de réalisation préférentiel de l'invention, donné à titre d'exemple illustratif et non limitatif, et des dessins annexés parmi lesquels :

  • la figure 1 est une vue en perspective éclatée d'une station d'épuration individuelle mettant en oeuvre une cuve selon l'invention ;
  • la figure 2 est une vue de dessus d'une cuve de traitement d'eaux selon l'invention ;
  • la figure 3 est une vue partielle d'une cuve de traitement d'eaux selon l'invention, schématisant l'intérieur de l'enceinte de clarification ;
  • la figure 4 est une vue en coupe transversale partielle des éléments en saillie d'une cuve d'une cuve selon l'invention.
Other features and advantages of the invention will emerge more clearly on reading the following description of a preferred embodiment of the invention, given by way of illustrative and non-limiting example, and the appended drawings in which:
  • the figure 1 is an exploded perspective view of an individual purification plant employing a tank according to the invention;
  • the figure 2 is a top view of a water treatment tank according to the invention;
  • the figure 3 is a partial view of a water treatment tank according to the invention, schematizing inside the clarification chamber;
  • the figure 4 is a partial cross-sectional view of the projecting elements of a tank of a tank according to the invention.

Le principe de l'invention apparaît clairement à la lecture des figures 1 et 3. Tel qu'illustré par ces figures, une cuve 1 de traitement et/ou de stockage d'eau selon l'invention présente une paroi externe présente des éléments en saillie 4.The principle of the invention appears clearly on reading the Figures 1 and 3 . As illustrated by these figures, a tank 1 for treatment and / or storage of water according to the invention has an external wall has projecting elements 4.

Chacun de ces éléments en saillie présente une surface d'appui 40, essentiellement plane, contre laquelle un matériau de remblaiement est susceptible d'exercer une force dirigée vers le fond 115 de la cuve et donc vers le fond de l'excavation dans lequel est installée la cuve.Each of these projecting elements has a bearing surface 40, essentially flat, against which a backfill material is capable of exerting a force directed towards the bottom 115 of the tank and thus towards the bottom of the excavation in which is installed the tank.

Préférentiellement, les éléments en saillie 4 forment au moins une ceinture autour de la cuve, et préférentiellement trois (voire plus) ceintures réparties sur la hauteur de la cuve tel qu'illustré par la figure 1.Preferably, the projecting elements 4 form at least one belt around the tank, and preferably three (or more) belts distributed over the height of the tank as illustrated by the figure 1 .

En référence aux figures 1 et 3, les éléments en saillie 4 présentent une section de forme triangulaire, comprenant notamment une surface d'appui 40 surplombant une surface inférieure 41.With reference to Figures 1 and 3 , the projecting elements 4 have a triangular section, including a bearing surface 40 overlying a lower surface 41.

La surface d'appui 40 des éléments en saillie peut être horizontale ou légèrement inclinée vers le bas.The bearing surface 40 of the projecting elements may be horizontal or slightly inclined downwards.

Selon un mode de réalisation particulier illustré par la figure 4, les éléments en saillie sont conçus avec les inclinaisons suivantes :

  • la surface d'appui 40 forme, avec la surface inférieure 41 d'un même élément en saillie, un angle α1 d'environ 90° ;
  • la surface d'appui 40 forme avec une ligne L horizontale (quand le fond de la cuve est lui-même dans un plan horizontal) un angle α3 compris entre environ 38°et 45°;
  • la surface inférieure 41 forme avec une ligne L horizontale (quand le fond de la cuve est lui-même dans un plan horizontal) un angle α4 compris entre environ 45°et 52°.
According to a particular embodiment illustrated by the figure 4 , the projecting elements are designed with the following inclinations:
  • the bearing surface 40 forms, with the lower surface 41 of the same projecting element, an angle α1 of about 90 °;
  • the bearing surface 40 forms with a horizontal line L (when the bottom of the tank is itself in a horizontal plane) an angle α3 of between approximately 38 ° and 45 °;
  • the lower surface 41 forms with a horizontal line L (when the bottom of the tank is itself in a horizontal plane) an angle α4 between about 45 ° and 52 °.

En tout état de cause, on prévoit des inclinaisons des surfaces d'appui 40 et 41 de telle sorte que α3 < α4. On note que, selon le présent mode de réalisation, les extrémités externes des éléments en saillie sont disposées les unes au-dessus des autres de façon à s'inscrire dans un même plan vertical.In any case, inclinations of the bearing surfaces 40 and 41 are provided so that α3 <α4. Note that, according to the present embodiment, the outer ends of the projecting elements are arranged one above the other so as to fit in the same vertical plane.

Toutefois, il est également envisageable que la cuve présente une forme externe différente, par exemple cylindrique, pyramidale...However, it is also conceivable that the tank has a different external shape, for example cylindrical, pyramidal ...

Outre le fait de favoriser le maintien de la cuve au fond de l'excavation une fois celle-ci remblayée, on note que ces éléments en saillie contribuent également au renforcement de la structure de la cuve vis-à-vis des risques d'écrasement vertical ou horizontal.In addition to promoting the maintenance of the tank at the bottom of the excavation once it is backfilled, it is noted that these projecting elements also contribute to the strengthening of the structure of the tank vis-à-vis the risk of crushing vertical or horizontal.

De plus, les valeurs d'angles indiqués précédemment sont optimisées pour favoriser le remplissage de l'espace entre la paroi externe de la cuve et les parois de l'excavation par le matériau de remblaiement. En effet, les inclinaisons des surfaces d'appui des éléments en saillie facilitent en quelques sortes l'écoulement du matériau de remplissage, en particulier entre deux éléments en saillie, c'est-à-dire dans la cavité qu'ils délimitent.In addition, the angle values indicated above are optimized to promote the filling of the space between the outer wall of the tank and the walls of the excavation by the backfill material. Indeed, the inclinations of the bearing surfaces of the projecting elements facilitate in some ways the flow of the filler material, in particular between two projecting elements, that is to say in the cavity they delimit.

Par ailleurs, en référence aux figures 1 et 2, une cuve 1 selon l'invention peut se présenter sous la forme d'une station d'épuration individuelle incluant, selon le présent mode de réalisation, deux enceintes, à savoir :

  • une enceinte d'aération 10 ;
  • une enceinte de décantation/clarification 11.
Moreover, with reference to Figures 1 and 2 , a tank 1 according to the invention can be in the form of an individual purification station including, according to the present embodiment, two enclosures, namely:
  • a ventilation enclosure 10;
  • a settling / clarifying chamber 11.

En partie supérieure de la station, un bac est prévu pour recevoir un tableau électrique destiné à alimenter un compresseur (non représenté) à partir duquel s'étend un conduit d'air débouchant dans l'enceinte d'aération 10.In the upper part of the station, a tank is provided to receive an electrical panel intended to supply a compressor (not shown) from which extends an air duct opening into the ventilation enclosure 10.

Le compresseur de l'enceinte d'aération est programmé pour effectuer des cycles successifs d'aération des eaux présentes dans l'enceinte d'aération. On rappelle effectivement que l'enceinte d'aération a pour but d'effectuer des phases successives d'aérobies et d'anoxie, en vue de provoquer une digestion des matières organiques présentes dans les eaux à traiter.The compressor of the ventilation chamber is programmed to perform successive cycles of aeration of the water present in the ventilation enclosure. It is recalled that the purpose of the aeration chamber is to carry out successive aerobic and anoxic phases, with a view to causing digestion of the organic matter present in the water to be treated.

Tel que cela apparait sur la figure 1, un conduit 100 débouche dans l'enceinte d'aération, les eaux à traiter arrivant dans la station par ce conduit 100.As it appears on the figure 1 a duct 100 opens into the ventilation enclosure, the water to be treated arriving in the station via this duct 100.

L'enceinte d'aération est séparée de l'enceinte de décantation/clarification par une paroi de séparation 12 dans laquelle est ménagé un orifice 120 communiquant avec un tuyau 111, s'étendant vers le fond de l'enceinte de clarification.The ventilation chamber is separated from the settling chamber / clarification by a partition wall 12 in which is formed an orifice 120 communicating with a pipe 111, extending towards the bottom of the clarification chamber.

Lorsque le niveau augmente dans l'enceinte d'aération, ceci dû à l'arrivée d'eau par le conduit 100, jusqu'à atteindre l'orifice 120, de l'eau passe de l'enceinte d'aération vers l'enceinte de décantation/clarification par le tuyau 111.When the level increases in the aeration chamber, this due to the arrival of water via the conduit 100, until reaching the orifice 120, water passes from the ventilation enclosure to the settling / clarification chamber by the pipe 111.

L'enceinte de décantation/clarification intègre une pompe 112, activée par cycles successifs programmés, permettant de :

  • laisser décanter les matières en suspension en phase de non fonctionnement de la pompe ;
  • pomper les boues décantées (donc non digérées) et les renvoyer vers l'enceinte d'aération, par l'intermédiaire d'un tuyau (non représenté).
The settling / clarifying chamber incorporates a pump 112, activated by successive cycles programmed, allowing:
  • let the suspended solids decant during the non-operation phase of the pump;
  • pump the sludge (thus undigested) and return to the ventilation chamber, through a pipe (not shown).

Un conduit 110 de sortie s'étend à partir de l'enceinte de décantation/clarification, pour permettre la sortie des eaux traitées. Ce conduit 110 est prévu en partie supérieure de l'enceinte de décantation/clarification. Par conséquent, il est nécessaire que le niveau d'eau augmente suffisamment dans l'enceinte de décantation/clarification, pour atteindre le niveau du conduit de sortie.An outlet duct 110 extends from the settling / clarification chamber, to allow the outlet of the treated water. This duct 110 is provided in the upper part of the settling chamber / clarification. Therefore, it is necessary that the water level increases sufficiently in the settling chamber / clarification, to reach the level of the outlet duct.

Lorsque le niveau d'eau augmente dans l'enceinte de décantation/clarification, les matières en suspension les plus lourdes décantent pendant la phase de non fonctionnement de la pompe 112, tandis que seules les matières en suspension les plus fines et les plus légères peuvent éventuellement remonter avec le niveau d'eau.When the water level increases in the settling / clarifying chamber, the heaviest suspended solids decant during the non-operating phase of the pump 112, while only the finest and lighter suspended solids may possibly rise with the water level.

En outre, une zone de siphoïde 20 constitue un passage obligé de circulation des eaux dans la station, reliant le volume interne de l'enceinte de clarification au conduit de sortie. Cette zone siphoïde, dans laquelle les eaux sont faiblement chargées en matières en suspension, est délimitée par une cloison siphoïde décrite plus en détails par la suite.In addition, a siphoid zone 20 constitutes a compulsory passage of water circulation in the station, connecting the internal volume of the clarification chamber to the outlet conduit. This siphoid zone, in which the waters are weakly charged with suspended matter, is delimited by a siphoid partition described in more detail later.

Avantageusement, un matériau filtrant 3 est disposé dans la zone siphoïde 20 délimitée par la cloison siphoïde 2, ce matériau filtrant s'étendant de telle sorte que les eaux passent obligatoirement par le matériau filtrant, celui-ci étant destiné à fixer des matières en suspension dans les eaux.Advantageously, a filter material 3 is disposed in the siphoid zone 20 delimited by the siphoid partition 2, this filtering material extending in such a way that the water necessarily passes through the filtering material, the latter being intended to fix suspended matter. in the waters.

Selon un mode de réalisation préférentiel, le matériau filtrant est constitué par de la pouzzolane (ou roche volcanique).According to a preferred embodiment, the filter material is constituted by pozzolana (or volcanic rock).

Selon des variantes envisageables, ce matériau filtrant peut également être constitué en tout ou partie par :

  • de la zéolite ;
  • du sable ;
  • de l'éponge ;
  • un matériau industriel du type en nid d'abeille.
According to possible variants, this filtering material may also be constituted in whole or in part by:
  • zeolite;
  • sand;
  • sponge;
  • an industrial material of the honeycomb type.

En référence à la figure 3, on note que l'enceinte de décantation/clarification est délimitée par :

  • la paroi de séparation 12 mentionnée précédemment ;
  • la paroi de sortie 113, à partir de laquelle s'étend le conduit de sortie ;
  • des parois latérales 114, reliant la paroi de séparation 12 et la paroi de sortie 113.
With reference to the figure 3 it is noted that the settling / clarification chamber is delimited by:
  • the partition wall 12 mentioned above;
  • the outlet wall 113, from which the outlet duct extends;
  • side walls 114, connecting the partition wall 12 and the outlet wall 113.

Selon le présent mode de réalisation, la paroi siphoïde 2 est disposée de façon à faire face à l'une des parois latérales 114.According to the present embodiment, the siphoid wall 2 is arranged to face one of the side walls 114.

Plus précisément, la cloison siphoïde s'étend à partir de son extrémité inférieure 21 au voisinage d'une des parois latérales 114 et remonte vers la partie supérieure de l'enceinte de décantation/clarification, ceci en s'écartant de la paroi latérale 114 correspondante, jusqu'à délimiter un espace de stockage 22 du matériau filtrant 3. Au-dessus de cet espace de stockage, la cloison siphoïde 2 se prolonge de façon à constituer un caisson 23 pourvu d'un fond, à l'intérieur duquel débouche le conduit de sortie. Cette partie de forme quasi cubique est donc la zone de prélèvement d'échantillons.More specifically, the siphoid wall extends from its lower end 21 in the vicinity of one of the side walls 114 and goes up towards the upper part of the settling / clarification chamber, this deviating from the corresponding side wall 114, until delimiting a storage space 22 of the filtering material 3. Above this storage space, the siphoid partition 2 extends to form a box 23 provided with a bottom, inside which opens the outlet duct. This portion of quasi-cubic shape is therefore the sampling area.

L'espace de stockage s'étend donc entre la cloison siphoïde, au-dessus de la partie inclinée de celle-ci, et la paroi latérale, au niveau où l'élément en saillie le plus haut de la cuve forme, à l'intérieur de la cuve, une concavité.The storage space therefore extends between the siphoid wall, above the inclined part thereof, and the side wall, at the level where the highest projecting element of the tank forms, at the inside the tank, a concavity.

Le matériau filtrant 3 est présent dans un bac 30 disposé de façon amovible dans l'espace de stockage.The filter material 3 is present in a tray 30 removably disposed in the storage space.

Par ailleurs, comme cela apparaît sur la figure 3, les éléments en saillie 4 de la paroi externe apparaissent également à l'intérieur de la station.Moreover, as it appears on the figure 3 the projecting elements 4 of the outer wall also appear inside the station.

Dans ce cas, l'angle α2 (figure 4) entre la surface supérieure 40 et la surface inférieure 41 des éléments en saillie, à l'intérieur de la cuve, est égale à l'angle α1, côté extérieur, soit environ 90°.In this case, the angle α2 ( figure 4 ) between the upper surface 40 and the lower surface 41 of the projecting elements, inside the tank, is equal to the angle α1, outer side, or about 90 °.

Il en résulte que la paroi de séparation 12 présente des bords latéraux 121 de forme complémentaire des éléments en saillie.As a result, the partition wall 12 has side edges 121 of complementary shape of the projecting elements.

De plus, le bac contenant l'élément filtrant présente lui aussi une forme adaptée à la forme des éléments en saillie.In addition, the tray containing the filter element also has a shape adapted to the shape of the projecting elements.

De ce fait, ce bac filtrant et ce regard de prélèvement sont mis en place en usine, et viennent reposer verticalement contre la partie inclinée de la paroi siphoïde d'une part et, d'autre part, contre la surface inférieure d'un élément en saillie.As a result, this filtering tank and this sampling chamber are set up in the factory, and come to rest vertically against the inclined part of the siphoid wall on the one hand and against the lower surface of an element on the other hand projecting.

Claims (10)

  1. Tank intended to be buried, liable to contain water or gas, comprising an outer wall defining a treatment chamber, notably that of a sewage treatment micro-station,
    the outer wall having projecting elements (4) each having an essentially plane bearing surface (40) against which a backfill material is liable to apply a force targeted towards the bottom of the tank, characterised in that the projecting elements (4) have a triangular-shaped cross-section.
  2. Tank according to claim 1, characterised in that, for each projecting element, the bearing surface (40) overhangs a bottom surface (41),
    the inclination of the bearing surface (40) with respect to a horizontal line being α3 and the inclination of the bottom surface (41) with respect to a horizontal line being α4, where α3 < α4.
  3. Tank according to claim 1, characterised in that the projecting elements (4) form at least one peripheral belt.
  4. Tank according to claim 2, characterised in that the projecting elements (4) form three peripheral belts on top of one another.
  5. Tank according to claim 1, characterised in that the projecting elements (4) also appear inside the tank.
  6. Tank according to claim 1, including at least two chambers of an individual sewage treatment station, one for aeration (10) and the other for clarification (11), the water to be treated passing from one into the other, the clarification chamber being connected to an outlet conduit (110) via a siphoniform zone (20) defined by a siphoniform partition (2),
    characterised in that a filtering material (3) is arranged in the siphoniform zone (20) such that the water passes through the filtering material, said material being intended to bind the substance suspended in the water.
  7. Tank according to claim 6, characterised in that the filtering material (3) is arranged in the upper part of the siphoniform zone (20).
  8. Tank according to claim 6, wherein the clarification chamber (11) is defined by a common separating wall (12) with the aeration chamber (10) and by an outlet wall (113) connected by two side walls (114), characterised in that the siphoniform partition (2) is arranged facing one of the side walls (114).
  9. Tank according to claim 8, characterised in that the filtering material (3) is present in a container (30) arranged removably in a storage area (22) extending between the side wall (114) and the siphoniform partition (2).
  10. Tank according to claim 9, characterised in that the container (30) containing the filtering element (3) has a shape adapted to the shape of the projecting elements (4).
EP13197050.1A 2012-12-17 2013-12-13 Water treatment vessel intended for being buried, including an outer wall having projecting elements Active EP2743209B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1262116A FR2999625B1 (en) 2012-12-17 2012-12-17 WATER TREATMENT TANK FOR BURNING, COMPRISING AN EXTERNAL WALL HAVING SIZED ELEMENTS

Publications (2)

Publication Number Publication Date
EP2743209A1 EP2743209A1 (en) 2014-06-18
EP2743209B1 true EP2743209B1 (en) 2016-04-27

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Application Number Title Priority Date Filing Date
EP13197050.1A Active EP2743209B1 (en) 2012-12-17 2013-12-13 Water treatment vessel intended for being buried, including an outer wall having projecting elements

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Country Link
EP (1) EP2743209B1 (en)
FR (1) FR2999625B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109814783A (en) * 2018-12-29 2019-05-28 北京市水利规划设计研究院 Point muscle lead annotation method for drafting and device based on MicroStation

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3014426A1 (en) * 2013-12-06 2015-06-12 P R D PURIFYING STATION COMPRISING AN AERATION AND ANOTHER CLARIFICATION ENCLOSURE INCLUDING A PASSAGE PROTECTED TO A SIPHOID ZONE
FR3115032B1 (en) 2020-10-12 2023-11-17 Innoclair Water treatment and/or storage installation, using a tank and a piezometer secured to each other.
FR3122101B1 (en) * 2021-04-23 2023-03-24 Innoclair Wastewater filtration device for non-collective sanitation installation

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5806702A (en) * 1997-08-08 1998-09-15 A.K. Industries, Inc. Ribbed storage tank
DK200100035A (en) * 2001-01-10 2002-07-11 Soerensen Peder Hoven throughput Well
DE20117980U1 (en) * 2001-11-07 2003-03-13 Kortmann Karl Sub-surface storage installation has fuel tank resting on cradle under a heavy mass of bulk material preventing upward motion in presence of rising ground water

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109814783A (en) * 2018-12-29 2019-05-28 北京市水利规划设计研究院 Point muscle lead annotation method for drafting and device based on MicroStation
CN109814783B (en) * 2018-12-29 2020-09-29 北京市水利规划设计研究院 Microstation-based stippling and drawing method and device for wire annotation

Also Published As

Publication number Publication date
FR2999625B1 (en) 2015-07-17
EP2743209A1 (en) 2014-06-18
FR2999625A1 (en) 2014-06-20

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